121510214440 has 64 divisors (see below), whose sum is σ = 279140904000. Its totient is φ = 47589696000.

The previous prime is 121510214437. The next prime is 121510214453. The reversal of 121510214440 is 44412015121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 489796 + ... + 694924.

It is an arithmetic number, because the mean of its divisors is an integer number (4361576625).

Almost surely, 2^121510214440 is an apocalyptic number.

121510214440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121510214440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139570452000).

121510214440 is an abundant number, since it is smaller than the sum of its proper divisors (157630689560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121510214440 is a wasteful number, since it uses less digits than its factorization.

121510214440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205450 (or 205446 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

Adding to 121510214440 its reverse (44412015121), we get a palindrome (165922229561).

The spelling of 121510214440 in words is "one hundred twenty-one billion, five hundred ten million, two hundred fourteen thousand, four hundred forty".